Automobile derrick



E. L. TIRR'ELL AUTOMOBILE DERRICK Filed March 15, 1923 2 Sheets-Sheet 1 E. L. TIRRELL AUTOMOBILE DERRICK sept. 7,1926. 1,598,897

Filed March 15, 192:5 2 sheets-sheet v 24 MFT mum.

/N VEN TOI? zigwm W/ TNES S E5 Patented Sept. 7, 1926.

UNITED STATES 1,5ea8a7 EDWARD LEO TRRELL, OF 'PHILLIPSBURQ NEXV JERSEY.

AUTOMOBILE DERRICK.

Application filed March '15, 1923. Serial No.' 625,256.

This invention relates to Vautomobile derricks and` has for an object to produce anv improved apparatus of this type which is so constructed and arranged that the vehi-l may be readily disassembled and loaded onto the truck, formingV a part of the struc-L ture, so that the truck may beused asQan 2U ordinary load-carrying vehicle. n Q

` These, and other objects which will be made more apparent throughout the further description ofthe invention, are attained byV means of apparatus embodying the `features '25 herein described, and i illustrated in the drawings accompanying and'forming a part hereof. I

In the drawings, Fig. 1 is a fragmental plan View of an automobile derrick embody- 80 ing my invention; Fig. 2 is a fragmental side elevat1on of the apparatus shown 1n" Fig. 1; Fig. 3 is an end elevation of the apparatus-shown in Figs. 1 and 2, portions being omitted for convenience of` illustration; and Fig. 4 is a detail sectional viewon an enlarged scale lof a portion of the apparatus illustrated in Figs. 1, 2 and 3.-

Automobile derricks, asVV usually constructed, almost wholly incapacitate the vehicle as 'a load-carrying vehicle. One of the lprincipal obiects of the present invention is to provide an apparatuswhich has all the advantageous features of a portable derrick and which, at the same time may be effectively employed as a'load-carryingr vehicle, both in connection with loads han-r dled bv the derrick, and inconnection with lesser loads, not necessitatingthe use of the der-rick. 1 As illustrated the vehicle is provided with a load-carrying platform 15', mounted on the frame thereof. As shown, the frame is provided withn a rear extension 6 on which a derrick 7 is mounted'. The extension 6 is not an important feature, and it is usually desirableto install the derrick on the lmain minimum l framek of the vehicle.V With either arrangementthe frame serves the double purpose kof supporting the load-carrying platform 5 and the derrick 7. In the illustrated em`` bodiment, `the frame is made upkof-suitably spaced longitudinally vextending beams 8 and cross beams 9, so arranged that intermediate longitudinal beams 8 project rearwardly to form, in effect, the extension 6.

The derricl employed is of special construction 'so as to provide access tothe plat- PATENT OFFICE,

form 5, through the rear end of the truck l for loading purposes,vand so as to obviate the necessity of employing a central mast kor a number of guy lineswhich are ordinarily essential with suchV derricks.

As illustrated, the boom 1() of the derricl may Vconsist of a heavy Vsteel pipe'provided at Yitslouter end with a sheave 11. The in- 11er and "lower end of the boom `is receivel by a steel socket member 12 which is pivotally mounted on a horizontally extend# ing pin 13v carried by and secured toa steel vshoe 14. 1

' With this arrangement, the boom y10 may be easilyv and quickly removed from the socket member 12, or the boom and socket member maybe removed` from the shoe 14. The boom may then. be loaded into the truck of the vehicle, or `into suitable and convenient brackets provided on one side of the truck, andthe truck may then be usedy as an ordinary load-carrying vehicle.Y n Y The shoe 14 is rotatively mounted on the frame of the truck or vehicle, and is preferably provided with an integrally formed bearing-shaft 15, which extends downward` ly through a bearing housinglG and is provided with suitable thrust bearings 17 and 18 for holding it in' place in the housing 16. YAs illustrated, the socket member 12 is provided at its inner or lower end with an extension 19, through which the pin Y13 projects. AThis extension is held against lateral movement, by ears V2O which are integrally formed with the shoe 14. The bearings 17 and 18 are preferably roller bearings and each is adapted to co-operate with aconical bearing face formed on the housing 16. These bearing faces are opposite-ly disposed and the bearings 17 andV 18 are so arranged with relation to the shaft 15 and the housing 16 that the upper bearing 17 takes downward thrusts imposed on the shoe 14,`where as the lower bearing 18 is capable of resisting upward or dislodging` forces which may be imparted to the shoe. The. bearing 18 1s held in place on the shaft l5, by means of a lock washer 21 and nut The housing 16 is specifically mounted on the frame of the vehicle so as to resist tilting strains which may be imparted to it. As shown, it is located between the two intermediate beams 8 of the frame, and its length, between the bearings l? and 1S, is substantially equal to the depth of the beam. lt is rigidly secured to the supporting beams S and to the end girder 23, of the frame, by means of transversely extending plates 2l and 25, which are rigidly secured to the frame and to suitable lugs provided on the housing.

The boom is supported by a single boomline 26 which extends between the boom and a connection 2S., carried by a portal-like superstructure which is rigidly mounted on the vehicle frame spanning the load platform.

As shown the line 26 extends -trom a bracket 2T, igidly secured to the boom, over a sheave, of a block 2G then orer a sheave ot a block 26, secured to a boom bracket 2T, then over a sheare of the block Q6 to a winding drum of usual construction. rlhe drum is not shown, but is preferably located on the frame of the truck under or directly behind the cab of the truck.

As illustrated, the superstructure consists of vertical lateral posts 29, shown as channel irons` which are secured to cross beams 9 forming a part ofthe frame, and whichare reinforced by diagonal struts 80. Each strut 30 is secured to one of the posts 29 at a point near the upper end of the post by means of bolts or rivets and is also secured to one of the cross beams 9 of the frame by means of an angle iron. An intermediate strut 3l extends between each of the struts 30 and its associated posts 29, one end being secured to the lower end ot' the post and the other to the strut 30, at `a point intermediate the ends of the strut. A top cord or cross member 32 extends between and is secured to the upper ends of the posts 29 by means of tie plates. rlhis member is reinfo ced by diagonals 33 (Fig. 3) which extend between it and the posts Q9. The boom line connection 28 is secured to a rearwardly extending member shown as a channel iron 34, which is secured to the top cord 32 at a point midway between its endn and is reinforced by diagonals 3l, extending between it and the posts Q9. (See 1,2 and 3.)

The member 34 is of such length that the boom line connection 2S is located vertically above the axis of rotation of the shoe 141. lilith this arrangement the boom is capable of swinging, unhampered by the superstructure. through an are of more than 180o and at the same time the superstructure, is so disposed that it is capable of effectively resisting tilting` strains which may be imparted to it by neri ial loading of the boom.

The shoe ll, and consequently the boom, may be turned to different positions by means of a worm and worm wheel, with which the derrick is provider. s shown, a segmental worm wheel 3G is rigidly secured to the shoe lfl, and meshes with a worm 3T, mounted on the frame of the vehicle. ylhe operatingl face of the worin wheel is concentric with the axis of rotation of the shoe and the worm is provided wi h a double-ended operating nds transiv rsely of the share` SS which eA vehicle frame and may be provided with two operatingv cranks, as shown in Fig. l.

rlhe inelin 'on of the boom may be varied by rai ng the effective length of the boom line QG through the medium of the winding drum windlass. The load-supporting line 39 extends over the sheare ll a d a slieafe of the block 2G. fis shown. both the at) extends around the winding drum construction preferably located under or immediately behind the cab of the truck.

ln order to prevent tilting of the vehicle fram-e while the derrick is being employed in shifting a load, jack arms or outriggers -l are pro-vided on the frame and so arranged that they may bel moved to an .extended position, as shown in dotted lines in Fig. 3, or to a position such that they do not projee` beyond the late-ral limits of the frame. As shown, each arm #l1 consists of an -beam located within a box-like housing 42, which is built up ot channel members and a plate and is rigidly secured to the lower flanges of the beams 8. he channels and the arms ell are so located, relatively to each other, that the longitudinal movement of each arm is guided by the other arm and one of the channels employed in the makeup of the boa-like housing` lll?. lVhen the arms 4l are extended the frame may be braced against tilting by locating a `iack or other braces under the outer end of each extended arm.

ln the drawings a grease cu i is shown clamped to the plates 25 and enclosing the lower end of the shaft l5 and the nut 22. rlhe vehicle frame may be provided with side boards, tail-gate and top, as is customary.

It will of course, be understood that the winding drums of the load-supporting line and the boom-line may be power actuated if desired, and that the gears may be employed between these drums and the engine of the rehicle, so that the engine may be employed in actuating the derrick while the vehicle is standing still.

The principal advantages of the structure illustrated as an embodiment of my invention is that the arrangementof the derrick proper and the superstructure is such that the derriclr has .a Wide range of operation and at the same time does notobst-ruct ac Cess to the load-carrying platform 5, from either side or the rear of the Vehicle.

' Another advantage'of this structure is that the derrick may be employed for loading `and unloading the truck forming a part of the structure. It `can also be employed for vall purposes for which any derricl is required, and in addition is portable.

A further `important advantage `of the structure illustrated is that the shoeJ 14e, and consequently the boom 10, is locked in the different positions to Which it is turned, by the Worm and Worm Wheel. This is particularly important during the transit and is, of course, important during` the operation of handling heavy loads, since it avoids the necessity of employing snub lines. A

It Will be apparent to those skilled in tl e art that various changes, modifications, additions, omissions and substitutions may be made in the apparatus illustrated Without departing fromlthe spirit and scope of the invention as set forth by the appended claims.

What I claim is l l. In an apparatus of the character described, a Vehicle frame, a derrick mount@ ed on the frame' and comprising a rotatable shoe, .a bearing shaft secured thereto, a housing located between the beamsof said frame and into which said shaft projects, means for rigidly securing ysaid housing to the frame, thrustbearings between said housing and said shaft, a boom pivotallymounted on said shoe, a super-structure mounted on the frame forward of the derricl, aboom line secured to said structure and said boom and meansV for operating said derrick.

2. In combination in an apparatus of the characterVd-escribed, a vehicle frame, a derrick mounted on the frame adjacentthe rear. end thereof and comprising a rotatable shoe, a bearing shaft l-secured to the shoe, a housing secured to the frame at points adjacent to its upper and lower ends and into Which said shaft projects, oppositely disposed thrust bearings located Within saidvhousing` in spaced relation yand actingbetween said shaft and'said housing, a boom pivotally mounted on said shoe, a superstructure mounted on the frame forward of said derrick, a boom-line secured to said structure 'and said boom, and means for operating said derricl.

In testimony whereof, I have hereunto subscribed my name this 12th day of March, 1923. i n

EDIARD LEO TIRRELL. 

